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Title: Thermoregulatory responses to ice slurry ingestion during low and moderate intensity exercises with restrictive heat loss
Authors: Alhadad S.B.
Low I.C.C. 
Lee J.K.W. 
Keywords: Heat mitigation
Issue Date: 2020
Publisher: Elsevier Ltd
Citation: Alhadad S.B., Low I.C.C., Lee J.K.W. (2020). Thermoregulatory responses to ice slurry ingestion during low and moderate intensity exercises with restrictive heat loss. Journal of Science and Medicine in Sport. ScholarBank@NUS Repository.
Abstract: Objectives: We investigated the thermoregulatory responses to ice slurry ingestion during low- and moderate-intensity exercises with restrictive heat loss. Design: Randomised, counterbalanced, cross-over design. Methods: Following a familiarisation trial, ten physically active males exercised on a motorised treadmill at low-intensity (L; 40% VO2max) or moderate-intensity (M; 70% VO2max) for 75-min, in four randomised, counterbalanced trials. Throughout the exercise bout, participants donned a raincoat to restrict heat loss. Participants ingested 2 g kg−1 body mass of ambient water (L + AMB and M + AMB trials) or ice slurry (L + ICE and M + ICE trials) at 15-min intervals during exercise in environmental conditions of Tdb, 25.1 ± 0.6 °C and RH, 63 ± 5%. Heart rate (HR), gastrointestinal temperature (Tgi), mean weighted skin temperature (Tsk), estimated sweat loss, ratings of perceived exertion (RPE) and thermal sensation (RTS) were recorded. Results: Compared to L + AMB, participants completed L + ICE trials with lower ΔTgi (0.8 ± 0.3°C vs 0.6 ± 0.2 °C; p = 0.03), mean RPE (10 ± 1 vs 9 ± 1; p = 0.03) and estimated sweat loss (0.91 ± 0.2 L vs 0.78 ± 0.27 L; p = 0.04). Contrastingly, Tgi (p = 0.22), Tsk (p = 0.37), HR (p = 0.31), RPE (p = 0.38) and sweat loss (p = 0.17) were similar between M + AMB and M + ICE trials. RTS was similar during both low-intensity (4.9 ± 0.5 vs 4.7 ± 0.3; p = 0.10) and moderate-intensity exercise (5.3 ± 0.47 vs 5.0 ± 0.4; p = 0.09). Conclusions: Per-cooling using ice slurry ingestion marginally reduced thermal strain during low-intensity but not during moderate-intensity exercise. Ice slurry may be an effective and practical heat mitigation strategy during low-intensity exercise such as in occupational and military settings, but a greater volume should be considered to ensure its efficacy. © 2020 Sports Medicine Australia
Source Title: Journal of Science and Medicine in Sport
ISSN: 14402440
DOI: 10.1016/j.jsams.2020.07.002
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